Machine tool



April 6 192eL J. P. BROOKE MACHINE TOOL Filed MELIGh 17, 1924 Il0 f6 am A TTURNEY Patented Apr. 6, 1926.

UNITED STATES PATENT oFFlCE, A-

JOHN P. BROOKE,y OF NABBEBTH, PENNSYLVANIA, ASSIGNOR TO NILES-BEMENT- i POND COMPANY, 0F NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

`MACHINE TOOL.

Application led latch 17, 1924. Serial N0. 699,877.

To all whom t mwy concern:

Be it known that I, JOHN-P. Bnooxn, a citizen of the United States, res1d1ng at Narberth, in the county of Montgomery and State of Pennsylvania, have invented certain new and useful Improvements in Machine Tools, of which the following 1s a specification.

This invention relates to machme tools and particularly to a key seat drillin or milling machine of the general type ilustrated in'the accompanying drawing. Such machines are used prlmarily for milling slots, cutting key-ways and similar operations. The primary object of the inventlon is to provide an improved/ machine of this t e. A

yfachining operations such as those above mentioned are more eiciently performed if a lubricant or coolant is flowed over the tool or tools during the cutting operation. The invention illustrated herein provides means for very .effectively performing such function. It is accordingly another object of the invention to provide an improved machine tool bed particularly-adapted to receive this lubricant as it 4'drains from the tools and conduct the same to a trough from which it may again be pumped to the tools, the construction preferably being such that the cutting chips are automatically separated from the lubricant.

A furtherrobject of the invention is to provide a machine tool bed as above described with improved means thereon for supporting the tool carriage and work holders and improved means cooperatin therewith for driving opposed cutter spin les car- `ried b the carriage.

Wit the above and other objects in view,

-my invention consists in the features of construction and operation set forth in the following specicationland illustrated in the accompanying drawing. In such drawing annexed hereto and forming a part of this specification, I have shown the preferred embodiment of m invention but it will be understood that t e invention can be other- Referring to the figures of the drawing:

Figure 1 is a plan view of my improved machine tool be Fig.y 2 is aside elevation' thereof partially in section.

Fig. 3 is a cross section through the bed on line 3 3 of Fig. 2 and showing'the tool carriage and its operating mechanism thereon.

Fig. 4 is a detail sectional view taken on line 4 4 of Fig. 3.

Fig. 5 is a cross section through the bed on line 5--5 of Fig. 2 and showing a work holder mounted thereon.

The machine illustrated and described' herein, while not limited to any particular cutting operation, is of the general type shown in Patent No. 28,627, dated June 5,u

1860. The most common operation performed by such machines is the cutting of key-seats in shafting, such an operation being illustrated both inl the drawings of the said patent and in the drawing accompanying this application. In such operation, the shaft to be cut is secured in a pair of chucks which center and hold the work in proper position between a pair of tool spindles supported on the cutter carriage. The chucks are ordinarily clamped to the bed of the machine, thereby holding they work stationary, while the cutter carriage is slidably mounted in a manner to be traversed along the bed in the cutting operation. The novel features of myinvention in connection with this machine will become apparent as the description proceeds.

The proper lubricating and cooling of the Vtools in operation is a feature of primary importance in my invention and the bed of the machine illustrated in the drawing and now' to be described forms the basis of this improvement. This bed which is adapted to rest on a base l comprises a body portion 2 having a pair of ways 3 and `4 eX-.

tending along the opposite sides of the top portion thereof. The bottom portion of the bed, as illustrated, is provided with apair of troughs 5 and 6 integral with the bed Aand extending along the opposite sides .provided in each o Between the trough 7 and trough 6, the bed is cored to provide two channels 8 for conducting the lubricant and chips falling thereinto downwardly into the trough 6. A communicating channel 9 is also provided in the bed between the troughs 5 and adjacent each end of the bedwhereby lubrlcant flowing into the trough 6 can flow therefrom into the trou h 5. A shoulder 10 is these channels 9 adjacent the trough 6 whereby chips and sediment which settle to the bottom of the trough 6 do not low into the trough 5 with the lubricant. I

The outer to surface 11 of each way 1s inclined inwar ly and downwardly cwhereby any lubricant dropping thereon: will drain inwardly into the trough 7. .The tool carriage 12 is slidably mounted oir these surfaces of the ways and is adapted to be traversed therealong by a screw 13 journaled in bearings 14 and `15 at the ends 'of the bed and threadedly engaging a nut 16 secured to the carriage. The inner ortions p of the ways project toward each ot er in a manner providing opposed upper and lower` parallel horizontal clamping surfaces 17 and 18. 'lhe work holder 19, illustratedin Fig. 5 and hereinafter described, is adapted to be clamped to these surfaces.

Transversely slidable on the carriage re-l spectively above the ways is a pair of tool vslides 20 respectively rotatably supporting tool spindles 21 and 22 therein, milling tools 21 and 22 being illustrated as mounted in the spindles. The outer ends of the spindles 21 and 22 are respectively splined to slide through driving gears 23 and 24 in gear boxes 25 and 26 mounted on the ends of the carriage. The tool slides are adapted to be automatically fed toward the work by a double threaded screw 27 threadedly connected to the slides and intermittently rotated through gears 28 and a ratchet gear 29 as the carriage reciprocates. The ratchet gear 29 is adapted to be rotated a predetermined amount in the feeding direction at each end of the carriage stroke by a pair of pawls (not shown) adjustably mounted in the slot 30 on the bed. A handwheel 28 is operatively connected to the gearing 28 for manually rotating the screw 27. Such feeding mechanism does not com- .prise a part of my present invention and is therefore not illustrated in detail herein.

A main driving shaft 31 extends longitudinally of the bed 2 above the trough 5. A bevel gear 32 rotatably journaled in the carriage and splined to the shaft 31 is in mesh with a bevel gear 33 keyed to a shaft 34 extending into the gear box 25. A spur gear 35 on the shaft 34 is operatively connected to the spindle driving gear 23 by means of two intermediate spur gears 36 and 37 in the box 25. A shaft 38 mounted transversely in the carriage is keyed at one end to the spur gear 36 and at its other end to a spur gear 39 in the gear box 26. This gear 39 is in mesh wit-lr the spindle driving gear 24. Rotation of the shaft 31 is adapted therefore to drive both cutter spindles in all positions of the tool carriage and tool slides.

A lubricating pump 40 is mounted on a bracket 41 secured to the carriage. supply pipe 42 for the pump extends downwardly into the trough 5. `The outlet pipe from the pumlp branches at 43 and leads therefrom to the pipes 44 which are adjustable to direct the cutting lubricant onto the toolsin operation. An over-flow relief valve is provided in the piping at 45. The pump is driven from the main drive shaft 31 through a pair of spur gears 46 and 47, the gear 46 being secured to the hub of the bevel gear 32.

The. work holder illustrated in Fig. 5 comprises a body member 19 on which Ais slidably mounted a pair of work holding and centering jaws 48. A double threaded screw 49 journaled at' 50 in the holder is threadedly connected to the jaws and may be rotated by a hand wheel 51 to engage the jaws with the work W. The member 19 rests on the upper horizontal surfaces 17 of the carriage ways and a clamping member 52, connected to the member by bolts 53, engages the lower horizontal surfaces 18. By tightening the nuts on bolts 53, the holder can be rigidly secured to the bed.

It is thought that the construction and The operation of the machine and the advanv at the end ofthe bed. This shaft drives both cutter spindles 21 and 22, the pump 40 and the screw 13, the driving connections not being shown. The screw is adapted to be automatically rotated in opposite directions to reciprocate the carriage by suitable' reversing mechanism not shown. This car-- riage reciprocating mechanism, not comprising a part of my present improvements, is not illustrated herein butmay be substantially like thatshown in the above mentioned patent. As the carriage is rcciprocated along the work W, which is clamped in the manner illustrated, the tools are automatically fed deeper into the work at each stroke until the desired`depth of cut has been reached.

During the cutting operation, pump 40 supplies a lubricant or coolant to the tools through the pipes 44. The lubricant and chips fall from the tools and work directly into the trough7 from which they ass through the channels 8 into the troug 6.

:an i

The chips and sediment settle tothe bottom of the trough 6 4while the lubricant flows over the shoulders 10 into the trough 5. It

should be understood that -the term lubricant is used throughout this specification` "and parallel with eac i trough, the bed between and beneath the said wa 's being formed into a trough for catching lubricant falling thereinto, the bed between the last named trough and one of the first namedtroughs bein formed to provide vaj lubricant conductin channel therebetween, and

,the bed respectively adjacent its ends being formed into two channels providing communication between the two first named troughs.

2. A machine tool bed comprising a body portionhaving two lubricant receiving troughs respectively extending horizontally along opposite sides thereof, a carriage supportmg way extending alongthe bed above and parallel with each trough, means for conducting chips and a lubricant falling between the ways to one of the troughs, and means providing a communicating channel between the two first named troughs and so constructed that the chips remain in the said one trough while the lubricant flows to the other trough.

3. A machine tool bed comprising a body portion' having two lubricant receiving troughs respectively extending horizontally along opposite sides thereof, a carria e supporting way extendin along the be above and parallel with eac trough, and means for conducting chips and a lubricant falling between the ways to one of the troughs, the

'bed between the troughs being constructed to forni a communicating channel therebetween and having a` shoulder for preventing chips from movin with the lubricant fromthe said one troug to the other trough.

4. In a milling machine, thecombination of a bed having a lubricant receiving trough formed integrally therewith and extending horizontally along one side thereof, a carriage supporting guidewa extendingalong the bed above and paralle with the trough, a tool carriage slidably mounted on the guideway, a pump carried by the carriage and adapted to force a lubricant from thel trough to a toolcarried by the carriage, and means integral with the bed providing a channel for conducting'such lubricant'to the trough as it falls from the tool.

5. In a spline milling machine, the combination of a bed havinga lubricant receiving trou h extending horizontally along one side t ereof, a pair of carriage supporting ways extending along opposite sides of the bed above and parallel with the trough, a carriage slidably mounted on the ways, two tool spindles carried by the carriage respectively above the ways, a pump carrie by the carriage adjacent the trough and adapted to force a lubricant from the trough to the tools carried by the spindles, a shaft extending along the bed adjacent the trough, operative Aconnections for driving the pump and spindles from the shaft, and means providing a channel for conducting the lubri-v cant to the trough as it falls from the tools. L6. In a spline milling machine, the combination of a bed having a pair of carriage supporting ways extending along opposite sides thereof, a carriage slidably mounted on the ways, two tool spindles carried by the carriage respectively above the ways, a shaft extending along the bed parallel with tlieways, a shaft in theA carriage .havin a splined driving connection with the rst shaft, a plurality of spur gears operatively connecting thesecond named shaft with the adjacent spindle, a shaft carried by" the carriage and keyed to one of such gears, and( a plurality of spur gears o erativelyconnecting the last named shaft):A spindle.

7. In a spline milling machine, the combination of a bed havin a lubricant receiving trough extending orizontally along one side thereof, .a pair of carriage support'- ing ways extending along opposite sides of the bed above and parallel with the trough, a carriage slidably mounted on the ways, two tool spindles carried by the carriage respectively above the ways, a pump carried b the carriage yadjacent the trou h and a apted to force a lubricant from t ey trough to the tools carried by the spindles, a shaft extending along the bed parallel with the ways, a shaft in the carriage having a splined driving connection with the first to the other j shaft, a plurality of spur gears operatively connecting the second named shaft with the adjacent spindle, a shaftcarried by the carriage and keyed to one of such gears, a plurality of spur gears operatively connecting the last named shaft to the other spindle, and a driving connection from the first named shaft to the pump.

8. In a machine tool, the combination of iis a bed having a pair of carriage supporting ways, and a work holding member mounted on the said inner portions and adapted to be clamped thereto.

9. In a machine tool, the .combination of' a bed having a pair of carnage supporting ways extending along opposite sides thereof, the outer top surface o each way being inelined downwardly and inwardly whereby any lubricant dropping thereon will drain inwardly and the inner portions of the ways projecting toward each other in a manner providing opposed upper and lower parallel horizontal clamping surfaces, a tool carriage slldably mounted on the said outer top surfaces of the ways, a work holding memberf mounted on the said inner portions and adapted to be clamped against the said opposed horizontal surfaces, and a pair of opposed clamping jaws on the work holding member for gripping a work piece therebetween.

In testimony whereof, I hereto aiix my signature.

JOHN P. BROOKE. 

